Blower for routing machines



A ril 20, 1926. 1,581,7i9

R. L. CARTER BLOWER FOR ROUTING MACHINES Filed Feb. 7, 1925 specification. Y

Patented Apr. 20, 1926.

UNITED STATES PATE 1,581,719 nr OFFICE- RAY L. cAga'rnn, or SYRACUSE, NEW YORK.

BLOWER FOR ROUTING MACHINES.

Application filed February 7, 1925. Serial No. 7,728.

To all whom it may concern: p i 1 Be it known that I,'RAY-L. CARTER, a citi- Zen of the United States, residing at Syracuse, 111- the county of Onondaga and, State of New York, have invented certain new and useful Improvements in Blowers for Routing Machines, of which thefollowing is a 'Thi s'invention relates to means for automatically removing the, chrpsand dust, re-

tor which drives the tools, by means of which formed with a cavityin which' a fan is operatively disposed, the said'fan being mounted upon and driven by the armature shaft,and

being arranged todr'aw air through the mo-.

tor for cooling the same, and then to force the air downwardly through taper-mg nozzlelike openings, by which the air may be directed in several streams that converge. at .or near the point where the routing. or shaplng tool 1s performlng its cutt ng work, thereby continuously blowing the dust and chips from the mortises and preventing the overa heating ofthe-tool," andenabling the operat0r atall times to obtain a clearv View of and to control the tool 2 and lts, execution. ,Thei'oavity in which-the fan rotates 1s preferably arranged for facilitating the free ex haust of the air through the funnel-shaped openings ofthe. Ihead Withoutretarding the A I attain these objects the means set forthin the detailed description which fol- --lows and as illustrated by theaccompanying drawing 111 which.

Figure 1 is a front side elevation of a routing. machlne w1th parts broken away for showing the construction and arrangement -ofthe dustand chip remover; also show ng the tool in the actof routing or mortising a piece of 'worln Fig. ,2, is a :top plan view 1 of the head of the motor casing, the point of separation of theheadfrom the casing beingindicated byline 2-2of Fig. 1. I And Fig. 3 is abottom face View of the motor casing head.

l n I v motor,1nclud1ng the armature shaft 3. The

i In the drawing, 2 represents an electric 'motor2 is preferably enclosed in a cylindrical casingv 4, which is normally open at its top and bottom ends, the top end preferably being closed by a cap 4, which supports the corresponding end ofthe" shaft 3, and also the terminals, as 55"of the electric circuit, by which the motor is controlled;

The bottom end of thelcasing 4 is preferably closed by a removable conical head 6, which serves as a bearing forthe lower end of the shaft 3, the said end extending below the head, and being threaded for the attachment 7 ofan ordinary chuck, as 7, which supports the routing or shaping tool, 8. lhearinature shaft 3 isprovided with a ball-bearing as 9, which is supported by the head, as

shownin Fig. 1.} Above the said bearing a the head is formed with a relatively, large upwardly facing cavity 6, in which is disposed a fan 10, the latter being rigid on the shaft 3, and between the fan and the armature is preferablydisposed a disc '10, which.

rests upon an annular ledge 6 -1thatsurrounds the cavity 6. The disc 10has a central opening lO ,vthrough which the air employed forcooling the motor is drawn downwardly by said fan; Below thecavity 6 and communicating therewith, the head ;is

formed with similar funnel-shaped passages or openings 12.-12, which preferably taper downwardly at such angles, as to direct the air,e hausted fromjthe motor in similar converglngstreams-towards the cutting end of the tool '8, as shown by arrows in Fig. 1.

- The tipsjof-the blades 10 of the fan preferably travel in a; circle, as indicated bythe broken line 1Q in Fig 2, and ,in order to render thc exhaust; of the air efiective for blowing thedust and chips from the mortise or socket, as 13 of thelwork l3i, and for cooling=the tool, the cavity- 6, beyond the normal path 10 of the fan,'is formed with similar oppositely facing spiral or eccentric portions, as-6 6, which expand as they approach the 1 funnel-shaped outlets 12512, and bothof said spirals preferably terminate at abrupt radialshoulders l2 which form portions of thefiaring mouthsof the said outlets. By-thisconstruction and arrangement the air that is collected and drivenforwardly by the rapidlyrotatingfan is readily forced downwardly into the saidv outlets, and by reason of the contraction of the lower ends of said outlets, the air becomes more or less c'ompressed and 1s therefore discharged from the head with suflicient force to "effecprojecting perforated arms 14'', which receive and are slidable vertically on similar tubular guides 15, the Stud guides having their lower ends anchored in sockets '16 of a base 16,'which is provided with a plane bottom that rests on a surface of the work 7 13. In the'guides '15 are disposed coilcompression springs 15", which tend to lift and hold the-motor and tool away from the work.

pinslfr, which pass through the guides and j engage thetop'ends of the springs. The

motor and tool are moved downwardly towards the work, by, means of pawl-and- "which the operator inserts a finger of each ratchet mechanisms, which comprise teeth 15 formed inthe outerfaces of the guides, and pawls 17, which are pivoted to the lower ends of links 17, theupper ends of said links being'pivoted to the arms 14'. The 'pawls are provided with loops 17 through hand,'for depressing the loopsand lowering the motor;- and tool towards the work 13.

The operator usually'places histhumbs be- 35 sockets 16.

neath lugs 18 ,'"which are integral to the By this construction and arrangement the tool 8 -mayber'noved downwardly step bystep, for routingor mortising todifferentdepths, as shown in Fig. 1. To'release the tool 8, the operator presses inwardly on the upwardly projecting ends 17 of the links.

This effects the outward swinging -of' the V pawls free of the teeth, and allows the tension of the springs'15 to lift themotor and tool away from the work. Tl1e base 16 is cut-away centrally," as at 16, or affording clearance for the tool 8, and for enabling the operator to readily observe and guide the tool. The value of my improved blower will be appreciated when-it is understood that in all accurate and precisework, it is necescuttings.

Q built electric motors, which for routing and sary to keep the surface of the work 13, over which the plane bottom of the base 16 slides, free and clear of even the smallest solid particles, which might cause the slight-'' est Variation in the level or depth of the- The cooling of the tool 8 is also a valuable and material'feature of my invention. My

routing machines are operated. by specially shaping work develop a speed, when the tools are running light, of from 14,000 to 18,000 R. M. The routing or shaping cavity,

work is usually effected at speeds which vary between 8,000 and 12,000 revolutions per minute, owing to whether the work comprises, for 'example, soft pine, or hard dry birch. At either of said working speeds the tool '8 tendsto heat up, and I have found that by-directmg strong streams of air towards the cutting point, as herein shown and described, the tool may be maintained at substantially/normal temperature during long streams of air that converge, near the free end of the tool, a fan mounted upon. and These springs are compressible by means of driven by said shaft, said fan being located within the hollow head adapted to force air continuously through the said openings and into the sockets wrought by said tool, for

blowing dust and chips from the said sockets, the interior of the-head being arranged with oppositely facing spiral recesses which communicate with the openings.

2. The. combination with a driven toolcarrying shaft and means to drive said shaft, of a cylindrical casing surrounding the driving means and having an end thereof formed with a concentric cavity that faces the driving means and with funnel-shapedopenings below and communicating with the corresponding portions of the outer margins of said cavity being enlarged spirally and said spiral portions terminating in abrupt shoulders, towards the line of the axis of said tool, a fan j driven by said shaft, said fan being disposed in-said cavityadapted to force continuous streams of air through said openings for cooling-the tool and for blowing chi s.

and dust from mortises and cavities wrong is by the tool. p

3. The combination with air-cooled driving means and a tool-carrying shaft connected thereto and a tool driven by said shaft, of a cylindrical 'casingsurrounding the driving means, a hollowhead for closing the bottom end of the casing, said head being formed with an upwardlyfacing cavity and with a plurality of downwardly tapering openings that communicate with said cavity, the saidopenings being arranged to direct streams of air adaptedtoconverge at or near the free end ofrthe' tool, a fan mounted upon and driven by said shaft, said fan being disposed in said cavity adapted to draw the air by which the dr'ivlng means is cooled downwardly through the casing and to continuously force the air through said tapering openings for blowing chips and dust that result from the cutting by said tool, away from the work, and means the said openings tapering.

for facilitating the free exhaust of the air from said cavity and for preventing the re-, tarding of the fan.

4. A blower for Work-performing tools including tool-driving means, a hollow c0nical head through which the tool projects having a fan chamber, and a fan carried by said means arranged in the chamber, said head having independent downwardly converging openings disposed below the fan and each separately communicating with the chamber so as to direct independent streams of air on opposite sides of the tool.

head through which the tool projects, and a 7 fan carried by said means, said head having independent downwardly converging openings disposed below the fan so as to direct independent streams of air on opposite sides of the tool and having opposed spiral walls leadinginto the respective cavities, the fan operating between the walls.

In testimony whereof I afiiX my signature.

RAY L. CARTER; 

